Study on insect repellent and antiseptic etc. in indoor air

Research outline
We investigated indoor air pollutants and changes in concentrations of houses using insecticides and preservatives. In addition, passive samplers for VOC measurement were evaluated by field test.

Implementation status
In the wooden house where high concentration (3800 μg / m 3) of paradichlorobenzene, an insecticide, was detected in indoor air, the change of the concentration of palladichlorobenzene in indoor air from November 2002 to January 2006 was investigated. Although it decreased gradually after removal of the insect repellent, it showed a value near the guideline value even after 1 year, and it did not become undetected. The reason for this is presumed that paradichlorobenzene is easy to adsorb, so it adsorbed to clothes and re-dissipated from clothing into the air.
Seven principal components of creosote were detected in the investigation of apartment houses that used creosote as a preservative. In addition, cell growth inhibition was observed in indoor air. It was found that evaluation of indoor air polluting chemical substances can be evaluated in more detail by using bioassay method together.
In a field test using a passive sampler (passive method) for VOC measurement, comparison was made with the active method which is the standard method. The passive method is a more compact, lightweight and simple measurement method without requiring a pump or a power supply for sampling, and it is clear that its practicality is recognized for five types of VOCs including palladichlorobenzene and it is usable .